Convenient synthesis of allenyl esters and amides by palladium catalyzed alkoxy- and amido-carbonylation of allenyl and propynyl halides
作者:Nguyen D. Trieu、Cornelis J. Elsevier、Kees Vrieze
DOI:10.1016/0022-328x(87)80416-3
日期:1987.5
Allenylesters R1R2C=C=C(H)C(O)R (R = OMe) or amides (R = NEt2) are formed with excellent selectivities and in good yields by carbonylation of propynyl and allenyl halides at 1–20 bar CO pressure in benzene, in the presence of MeOH or HNEt2 and 1% of Pd(PPh3)4 or trans-Me2C=C=C(H)Pd(PPh3)2Br. Possible organometallic intermediates are discussed.
通过丙炔基和烯丙基卤化物在1处羰基化,可以形成具有优异选择性和高收率的烯丙基酯R 1 R 2 C = C = C(H)C(O)R(R = OMe)或酰胺(R = NEt 2)。在MeOH或HNEt 2和1%Pd(PPh 3)4或反式-Me 2 C = C = C = C(H)Pd(PPh 3)2 Br存在下,苯中的–20 bar CO压力。讨论了可能的有机金属中间体。
Catalytic Iron-Mediated [4 + 1] Cycloaddition of Diallenes with Carbon Monoxide
作者:Matthew S. Sigman、Bruce E. Eaton
DOI:10.1021/ja962908o
日期:1996.1.1
determining associative coordination of diallene to form a diallene−iron complex. The effect of coordinating solvents on this cycloaddition reaction suggests that the synthetic utility of these transformations can now be expanded to include diallenes with functional groups that may only weakly coordinate to the iron. Only one sterically demanding substituent on the diallene termini is necessary to give good
Synthesis of Cross-Conjugated Polyenes via Palladium-Catalyzed Oxidative C–C Bond Forming Cascade Reactions of Allenes
作者:Veluru Ramesh Naidu、Jan-E. Bäckvall
DOI:10.1021/acs.joc.0c00186
日期:2020.4.17
allenyne followed by a carbocyclization of the generated Pd-intermediate was developed. This cascade reaction afforded functionalized cross-conjugatedpolyenes. The enallene is initially activated by palladium and reacts with the allenyne to give the cross-conjugatedpolyenes.
Stereoselective Synthesis of Chiral 3-Aryl-1-alkynes from Bromoallenes and Heterocuprates
作者:Anna Maria Caporusso、Alessia Zampieri、Laura Antonella Aronica、Donatella Banti
DOI:10.1021/jo0522456
日期:2006.3.1
The synthesis of chiral 3-aryl-1-alkynes 3 via cross-coupling of 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes 1 and arylbromocuprates (RCuBr)MgBr·LiBr 2 was examined. With phenylcopper reagents and its para-substituted derivatives, as well as with 2-naphthyl cuprates, the reaction gave compounds 3 with high regioselectivity and good yields on the chemically pure product. On the contrary, when ortho-substituted
One pot stereoselective synthesis of chiral α,ω-diynes from bromoallenes and organobis(heterocuprates)
作者:Anna Maria Caporusso、Laura Antonella Aronica、Roberto Geri、Marco Gori
DOI:10.1016/s0022-328x(01)01438-3
日期:2002.4
di-Grignard reagents, obtained from 1,4-dibromobutane and 1,4-dibromobenzene, respectively, with CuSPh and LiCuBr2. The cross-coupling reaction of these di-cuprate reagents with 3-alkyl and 3,3-dialkyl 1-bromo-1,2-dienes (1) provides a general method for selective synthesis of 1,9-decadiynes (5) and 1,4-bis(2-propynyl)benzenes (6), characterized by two identical chiral centres in the α position to the triple